Illinois · Tax year 2026
Illinois 1099 Tax Calculator
Estimate your 2026 taxes as an Illinois freelancer: federal self-employment tax, federal income tax, and the state's flat 4.95% income tax — calculated together below.
Estimated total tax
$0
effective rate 0%
Per quarter
$0
Illinois uses a flat 4.95% rate. Simple to predict — the same percentage applies whether you earn $20k or $200k. State figure is an estimate — see our methodology.
Illinois 1099 taxes, explained
Illinois freelancers face three taxes on the same net profit: federal self-employment tax (see our self-employment tax calculator), federal income tax, and a flat Illinois state income tax of 4.95%. Unlike California or New York, there are no rising brackets at the state level — everyone pays the same rate, which makes budgeting straightforward.
Illinois quarterly estimated taxes
If you'll owe more than $1,000 in Illinois tax, file quarterly estimates on Form IL-1040-ES with the Illinois Department of Revenue, alongside your federal estimates. Setting aside roughly 5% of profit for state tax — plus your federal share — keeps you covered. See how much to set aside for 1099 taxes.
Frequently asked questions
What is the Illinois income tax rate for 1099 contractors?
Illinois has a flat 4.95% individual income tax on your net self-employment income, on top of federal self-employment and income tax.
Does Illinois require quarterly estimated taxes?
Yes. If you expect to owe more than $1,000 in Illinois tax, file quarterly estimates (Form IL-1040-ES), separate from your federal estimates.
Is the Illinois flat tax the same for everyone?
Yes — a single 4.95% rate applies to all taxable income. Personal exemptions slightly reduce the base, which our estimate doesn't include, so treat the state figure as a small over-estimate.
Other state calculators
Compare your tax in other states — your federal bill stays the same, but state tax varies widely:
- California · Graduated 1%–13.3%
- New York · Graduated 3.9%–10.9% (+NYC)
- Texas · No state income tax
- Florida · No state income tax
- Washington · No state income tax
- Pennsylvania · Flat 3.07%
- North Carolina · Flat 3.99%
- Georgia · Flat 5.19%
- Arizona · Flat 2.5% (lowest)
- Michigan · Flat 4.25%
- Colorado · Flat 4.4%
Estimates based on 2026 federal and Illinois figures; state tax estimate excludes state-specific deductions and credits. Not tax advice — confirm with the IRS, your state tax agency, or a professional. See our disclaimer.